///////////////////////////////////////////////////////////////////////////////////
/// OpenGL Mathematics (glm.g-truc.net)
///
/// Copyright (c) 2005 - 2015 G-Truc Creation (www.g-truc.net)
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
/// 
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
/// 
/// Restrictions:
///		By making use of the Software for military purposes, you choose to make
///		a Bunny unhappy.
/// 
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/// THE SOFTWARE.
///
/// @ref gtx_bit
/// @file glm/gtx/bit.inl
/// @date 2014-11-25 / 2014-11-25
/// @author Christophe Riccio
///////////////////////////////////////////////////////////////////////////////////

namespace glm {
    ///////////////////
    // highestBitValue

    template<typename genIUType>
    GLM_FUNC_QUALIFIER genIUType
    highestBitValue(genIUType
    Value) {
    genIUType tmp = Value;
    genIUType result = genIUType(0);
    while(tmp) {
    result = (tmp & (~tmp + 1)); // grab lowest bit
    tmp &= ~
    result; // clear lowest bit
}
return
result;
}

template<typename T, precision P, template<typename, precision> class vecType>
GLM_FUNC_QUALIFIER vecType<T, P>
highestBitValue(vecType<T, P>
const & v)
{
return
detail::functor1<T, T, P, vecType>::call(highestBitValue, v
);
}

///////////////////
// powerOfTwoAbove

template<typename genType>
GLM_FUNC_QUALIFIER genType
powerOfTwoAbove(genType
value)
{
return
isPowerOfTwo(value)
? value :
highestBitValue(value)
<< 1;
}

template<typename T, precision P, template<typename, precision> class vecType>
GLM_FUNC_QUALIFIER vecType<T, P>
powerOfTwoAbove(vecType<T, P>
const & v)
{
return
detail::functor1<T, T, P, vecType>::call(powerOfTwoAbove, v
);
}

///////////////////
// powerOfTwoBelow

template<typename genType>
GLM_FUNC_QUALIFIER genType
powerOfTwoBelow(genType
value)
{
return
isPowerOfTwo(value)
? value :
highestBitValue(value);
}

template<typename T, precision P, template<typename, precision> class vecType>
GLM_FUNC_QUALIFIER vecType<T, P>
powerOfTwoBelow(vecType<T, P>
const & v)
{
return
detail::functor1<T, T, P, vecType>::call(powerOfTwoBelow, v
);
}

/////////////////////
// powerOfTwoNearest

template<typename genType>
GLM_FUNC_QUALIFIER genType
powerOfTwoNearest(genType
value)
{
if(
isPowerOfTwo(value)
)
return
value;

genType const prev = highestBitValue(value);
genType const next = prev << 1;
return (next - value) < (value - prev) ? next :
prev;
}

template<typename T, precision P, template<typename, precision> class vecType>
GLM_FUNC_QUALIFIER vecType<T, P>
powerOfTwoNearest(vecType<T, P>
const & v)
{
return
detail::functor1<T, T, P, vecType>::call(powerOfTwoNearest, v
);
}

}//namespace glm
